Control method for whole-plant primary frequency modulation of one-pipe multi-machine hydropower station

Abstract

The invention discloses a whole-plant primary frequency modulation control method for a one-tube multi-machine hydropower station, and relates to the field of power system control optimization, and the method comprises the steps: inputting a primary frequency modulation function, collecting the frequency, guide vane opening, active power and primary frequency modulation action signals of each unit, and setting an artificial frequency dead zone; judging a speed regulation system control mode; selecting a unique frequency input signal of primary frequency modulation control of the whole plant, and judging a primary frequency modulation action direction; determining a unit dynamic input sequence under different control modes and different action directions of primary frequency modulation; the deviation value of the actual action quantity and the theoretical action quantity of the primary frequency modulation is calculated and compared with the control dead zone until the deviation value is within the range of the control dead zone, the problem that the primary frequency modulation performance is unqualified due to the strong coupling effect between the units of the one-pipe multi-machine hydropower station is solved, and the primary frequency modulation regulation control effect is improved.

Description

technical field [0001] The invention relates to the field of power system control optimization, and relates to a control method for the primary frequency regulation of the whole plant of a one-pipe multi-machine hydropower station. Background technique [0002] At present, the primary frequency regulation control of hydropower plants is independently controlled by unit units. This control method can meet the assessment requirements of power grid companies for primary frequency regulation in hydroelectric generating units with conventional layout. In low-cost hydropower stations, several units often share a water delivery system. Under the joint water supply mode of multiple units in one pipe, the units are interrelated and affect each other. The strong coupling between the units under the influence of variables amplifies the impact of the water hammer effect on the units under the frequency disturbance, resulting in the response lag time and adjustment time of a frequency mo...

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Problems solved by technology

[0002] At present, the primary frequency regulation control of hydropower plants is independently controlled by unit units. This control method can meet the assessment requirements of power grid companies for primary frequency regulation in hydroelectric generating units with conventional layout. In low-cost hydropower stations, several units often share a water delivery system. Under the joint water supply mode of multiple units in one pipe, the units are interrelated and affect each other. The strong coupling between the units under the influence of variables amplifies the impact of the water hammer effect on the units under the frequency disturbance, resulting in the response lag time and adjustment time of a frequency modulation being much longer than the action time of a single unit in a non-disturbance environment, which in turn makes a The frequency modulation performance index and integral contribution power do not meet the assessment requirements of the two detailed rules of the power grid, and this problem will be exacerbated with the increase of frequency disturbance

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